直接测出了反弧门不同开度的收缩系数值；

The contraction coefficient of different valve opening were found out directly;

改进可变容差法中放大系数与收缩系数的取法,提高了寻优速度,可满足在线优化对寻优速度的要求.

The online optimization calculation is accelerated by improving magnifying and contracting coefficients of flexible tolerance method.